upgradeable dacs

What formats are we talking about here? If its just redbook, I'm not sure how much more designers are going to get out of it. Its a pretty mature format. As far as everything else goes, I wouldn't get too worked up over it. If you buy something that sounds good to you now, it should still sound good in the future, even if there are upgrades. Not only that, who's to say the upgrades will be the best sounding option? Maybe in the future, you will be able to spend $500 on something that you like better and costs less than an upgrade. Anything can happen, especially with newer technologies.

Audioengr,

I know quite a few people who don't like upsampling, as well. So far, I personally tend to prefer it but I have heard some very good sound from non upsampling players also. When I say that Redbook is a mature format, I don't mean that in a negative way. To clarify, I just meant that you can get excellent sound without having to spend alot of money. And that if Redbook is all you need I wouldn't be too afraid to buy something now. I also feel its amazing how far CD has come in terms of SQ since it was first introduced. High end designers deserve a huge amount of respect and credit for the work they have done.

"These are recent advancements, so there is still a LOT of gas left in redbook IMO."

Excellent. Honestly, I haven't bought a new CD player and/or Dac in a few years and didn't know they were getting that much better. A little better, maybe, but not much more. Can you list a few examples? I'd like to hear them for myself. I'm a really good salesperson. I can talk myself into buying just about anything when it comes to new gear.